stevel 02/01/13 16:01:50
Added: src/main/org/apache/tools/ant/taskdefs/condition
FilesMatch.java
Log:
condition for files matching
Revision Changes Path
1.1
jakarta-ant/src/main/org/apache/tools/ant/taskdefs/condition/FilesMatch.java
Index: FilesMatch.java
===================================================================
/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Ant", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.tools.ant.taskdefs.condition;
import org.apache.tools.ant.BuildException;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
/**
* compare two files for bitwise equality based on size and content.
timestamps
* are not looked at at all.
*
* @author Steve Loughran
* @created 12 January 2002
* @since Ant 1.5
*/
public class FilesMatch implements Condition {
/**
* files to compare
*/
private File file1, file2;
/**
* Sets the File1 attribute
*
* @param file1 The new File1 value
*/
public void setFile1(File file1) {
this.file1 = file1;
}
/**
* Sets the File2 attribute
*
* @param file2 The new File2 value
*/
public void setFile2(File file2) {
this.file2 = file2;
}
/**
* simple but sub-optimal comparision algorithm.
* written for working rather than fast. Better would
* be a block read into buffers followed by long comparisions
* apart from the final 1-7 bytes.
*/
public boolean simpleFileCompare(File f1,File f2) throws IOException {
BufferedInputStream in1=null;
BufferedInputStream in2=null;
boolean matches=true;
try {
in1=new BufferedInputStream(new FileInputStream(f1));
in2=new BufferedInputStream(new FileInputStream(f2));
int c1,c2;
do {
c1=in1.read();
c2=in2.read();
if(c1!=c2) {
matches=false;
}
} while(matches && (c1!=-1));
} finally {
try {
if(in1!=null) {
in1.close();
}
} catch(IOException e) { }
try {
if(in2!=null) {
in2.close();
}
} catch(IOException e) { }
}
return matches;
}
/**
* comparision method of the interface
*
* @return true if the files are equal
* @exception BuildException if it all went pear-shaped
*/
public boolean eval()
throws BuildException {
//validate
if (file1 == null || file2 == null) {
throw new BuildException("both file1 and file2 are required in
fileequals");
}
if (!file1.exists()) {
throw new BuildException("file " + file1 + " not found");
}
if (!file2.exists()) {
throw new BuildException("file " + file2 + " not found");
}
//shortcut tests
//#1 : same filename => true
if(file1.equals(file2)) {
return true;
}
//#2 : different size =>false
if(file1.length()!=file2.length()) {
return false;
}
//#now match the files
boolean matches=false;
try {
matches=simpleFileCompare(file1,file2);
} catch(IOException ioe) {
throw new BuildException("when comparing files", ioe);
}
return matches;
}
}
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